Reset transmit timeout on terminal re-connect.

Author: ghent360

Diff for: cores/arduino/USBSerial.cpp

@@ -66,7 +66,7 @@ size_t USBSerial::write(uint8_t ch)
 size_t USBSerial::write(const uint8_t *buffer, size_t size)
 {
   size_t rest = size;
-  while (rest > 0) {
+  while (rest > 0 && CDC_connected()) {
     // Determine buffer size available for write
     auto portion = (size_t)CDC_TransmitQueue_WriteSize(&TransmitQueue);
     // Truncate it to content size (if rest is greater)
@@ -83,8 +83,6 @@ size_t USBSerial::write(const uint8_t *buffer, size_t size)
       buffer += portion;
       // After storing data, start transmitting process
       CDC_continue_transmit();
-    } else if (!CDC_connected()) {
-      break;
     }
   }
   return size - rest;

Diff for: cores/arduino/stm32/usb/cdc/usbd_cdc_if.c

@@ -179,6 +179,9 @@ static int8_t USBD_CDC_Control(uint8_t cmd, uint8_t *pbuf, uint16_t length)
     case CDC_SET_CONTROL_LINE_STATE:
       lineState =
         (((USBD_SetupReqTypedef *)pbuf)->wValue & 0x01) != 0; // Check DTR state
+      if (lineState) { // Reset the transmit timeout when the port is connected
+        transmitStart = 0;
+      }
       break;
 
     case CDC_SEND_BREAK: